<template>
	<view>
		<view class="search-box">
			<uni-search-bar :radius="18" cancelButton="none" :focus="true" @input="input">
			</uni-search-bar>
		</view>
		<!-- 搜索建议列表 -->
		<view class="sugg-list" v-if="searchResults.length !== 0">
			<view class="sugg-item" v-for="(item,i) in searchResults" :key="i">
				<view class="goods-name" @click="gotoDetail(item.goods_id)">{{item.goods_name}}</view>
				<uni-icons type="arrowright" size="16" ></uni-icons>
			</view>
		</view>


		<!-- 搜索历史 -->
		<view class="history-box" v-else>
			<!-- 标题区域 -->
			<view class="history-title">
				<text>搜索历史</text>
				<uni-icons type="trash" size="18" @click="cleanHistory"></uni-icons>

			</view>

			<!-- 列表区域 -->
			<view class="history-list">
				<uni-tag :text="item" v-for="(item,i) in histories" :key="i" @click="gotoGoodsList(item)"/>
			</view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				// 自动获取焦点
				show: true,
				showSync: true,
				// 防抖处理
				timer: null,
				kw: '',
				// 搜索结果列表
				searchResults: [],
				// 搜索历史数组
				historyList: []
			};
		},
		onLoad() {
			this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
		},
		methods: {
			
			search(res) {
				uni.showToast({
					title: '搜索：' + res.value,
					icon: 'none'
				})
			},
			input(res) {
				// console.log('----input:', res)
				// 防抖处理
				clearTimeout(this.timer)
				this.timer = setTimeout(() => {
					this.kw = res
					// 根据关键词，查询搜索建议列表
					this.getSearchList()
				}, 500)
			},


			focus(e) {
				uni.showToast({
					title: 'focus事件，输出值为：' + e.value,
					icon: 'none'
				})
			},

			async getSearchList() {
				// 判断关键词是否为空
				if (this.kw === '') {
					this.searchResults = []
					return
				}
				const {
					data: res
				} = await uni.$http.get('/api/public/v1/goods/qsearch', {
					query: this.kw
				})
				if (res.meta.status !== 200) return uni.$showMsg()
				this.searchResults = res.message
				
				// 保存历史关键字
				this.saveSearchHistory()
			},
			gotoDetail(goods_id) {
				uni.navigateTo({
					// 指定详情页面的 URL 地址，并传递 goods_id 参数
					url: '/subpkg/goods_detail/goods_detail?goods_id=' + goods_id
				})
			},
			saveSearchHistory(){
				// this.historyList.push(this.kw)
				// 1. 将 Array 数组转化为 Set 对象
				  const set = new Set(this.historyList)
				  // 2. 调用 Set 对象的 delete 方法，移除对应的元素
				  set.delete(this.kw)
				  // 3. 调用 Set 对象的 add 方法，向 Set 中添加元素
				  set.add(this.kw)
				  // 4. 将 Set 对象转化为 Array 数组
				  this.historyList = Array.from(set)
				  
				  // 调用 uni.setStorageSync(key, value) 将搜索历史记录持久化存储到本地
				  uni.setStorageSync('kw',JSON.stringify(this.historyList))
			},
			// 清空历史记录
			cleanHistory(){
				console.log('clean')
				this.historyList = []
				uni.setStorageSync('kw','[]')
			},
			gotoGoodsList(kw){
				uni.navigateTo({
					url:'/subpkg/good_list/good_list?query=' + kw
				})
			}
		},
		computed:{
			histories(){
				return [...this.historyList].reverse()
			}
		}
	}
</script>

<style lang="scss">
	.search-box {
		position: sticky;
		top: 0;
		z-index: 999;
	}

	.uni-searchbar {
		background-color: #C00000;
	}

	.sugg-list {
		padding: 0 5px;

		.sugg-item {
			font-size: 12px;
			padding: 13px 0;
			border-bottom: 1px solid #efefef;
			display: flex;
			justify-content: space-between;
			align-items: center;

			.goods-name {
				white-space: nowrap;
				overflow: hidden;
				text-overflow: ellipsis;
				margin-right: 3px;
			}
		}
	}

	.history-box {
		.history-title {
			padding: 5px 10px;
			display: flex;
			justify-content: space-between;
			align-items: center;
			font-size: 13px;
			height: 40px;
			border-bottom: 1px solid #efefef;
		}

		.history-list {
			padding-top: 10px;
			display: flex;
			flex-wrap: wrap;

			uni-tag {
				margin: 10px;
			}
		}
	}
</style>